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Capacitive temperature and pressure transducer

  • US 5,663,506 A
  • Filed: 08/21/1995
  • Issued: 09/02/1997
  • Est. Priority Date: 08/21/1995
  • Status: Expired due to Fees
First Claim
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1. Apparatus for measuring and comparing pressures, comprising:

  • (a) means for detecting a temperature variation and for providing a temperature sensor signal representative of the temperature variation;

    (b) means for sensing an absolute pressure and for providing an absolute sensor signal representative of the absolute pressure;

    (c) means for sensing a differential pressure and for providing a differential sensor signal representative of the differential pressure;

    (d) means for selecting one of said temperature detecting means, absolute pressure sensing means or differential pressure sensing means for reading the respective sensor signal of the selected means;

    (e) means responsive to the selecting means for comparing the temperature sensor signal to the differential sensor signal and for generating a first comparative signal representative of the ratio between the temperature sensor signal and the differential sensor signal; and

    (f) means responsive to the selecting means for comparing the temperature sensor signal to the absolute sensor signal and for generating a second comparative signal representative of the ratio between the temperature reference signal and the absolute sensor signal.

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